Improvement in shuttles for sewing-machines



W. H. HOCKENSMITH.

Sewing-Machine Shuttle.

No ]25,956 Patented April23,1872.

Emblems: 11mm: fiwa 2W/ 2 2 144M gvfimegsf IMPROVEMENT IN SHUTTLES FORSEWING-MACHINES.

Specification forming part of Letters Patent No. 125,956, dated April23, 1872.

Specification describing a new and useful Improvementin Sewing-MachineShuttles, invented by WILLIAM H. HOGKENSMITH, of Bridgeport, in thecounty of Fairfield and State of Connecticut.

This invention relates to improvements in thread-tension devices forsewing-machine shuttles; and consists in arranging a temperscrew and aspring with a yoke or arm that confines the journal of the bobbin-holderin position, and also produces tension on the thread, as hereinafterspecified.

Figure 1 is a plan of the face of a shuttle with my improvementsapplied. Fig. 2 is partly a longitudinal section, and partly a sideelevation. Fig. 3 is a section of the bar.

Similar letters of reference indicate correspondin g parts.

The U-shaped bar A, commonly used for confining one of thebobbin-pivots, has one or more holes a through one side near the center,and the thread b is passed through it and along another eye in the sideof the shuttle, between the bar and the said side of the shuttle, afterpassing over the arm 0 of the bar, as clearly shown in Fig. 1, and atemper-screw, D, with an adjusting-nut, E, and a tensionspring, F, arefitted in the. cavity of the shuttle at the upper side, preferably atthe point, and the bar is pivoted 011 said screw, and all the parts areso adjusted that the nut and spring being forced by the screw againstthe end of the bar cause it to press the thread against the side of theshuttle with more or less force, as required, which can be adjusted tothe greatest nicety. The screw is so pivoted that it does not moveendwise, but moves the nut against the spring or from it, and thuscauses the bar to bear with more or less force, as required, the otherend of the bar being prevented from springing away from the side of theshuttle, which is done in this case by bending it around, and so that itextends back to the pivot on the other side, and forms the guide-bar orarm C for the thread. In this case I have made the part C of theshuttle, against which the thread is pressed, separate from the otherpart, and have connected it to the barA by a rivet, H, so as tobearagainst the side of A at the side of the eye a, opposite the rivetH; but the point 01 of A is bent away from C to facilitate theintroduction of the thread. The shuttle is cut out in the curved formshown at the rear, nearly to the end, to provide room for the bow of thebar A, and thus provide space for elongating the shuttle.

This arrangement does not necessitate the shortening of the shuttlecavity which is necessary when the tension device is arranged at one endthereof, and it is less expensive than such arrangements.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- The temper-screw D, nut, and spiral spring E,arranged with the yoke or arm of the bobbin-holder or bar A, as shownand described, whereby said screw forms both the pivot of the yoke andregulates the tension of the thread,

as set forth. 7

- WM. H. HOCKENSMITH.-

Witnesses:

GEo. A. STAPLES, J. O. FOWLER.

